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Graphical Analysis of the CCRL Portland Cement Proficiency Sample Database (Samples 1-72).


pdf icon Graphical Analysis of the CCRL Portland Cement Proficiency Sample Database (Samples 1-72). (5094 K)
Spring, C. B.; Pielert, J. H.; Leigh, S.; Heckert, N. A.

NISTIR 5387; 123 p. March 1994.

Available from:

National Technical Information Service
Order number: PB94-196557

Keywords:

cements; construction; standards; test methods; databases; graphics

Abstract:

A large database of Portland cement and Portland cement concrete interlaboratory test results has been generated at the Cement and Concrete Reference Laboratory (CCRL) since 1965. The database represents a rich resource inasmuch as the cements tested were produced by many different production facilities, from raw materials obtained from different geological areas, and over a long period of time. Participation varies from 120 to over 200 laboratories located throughout the United States and in several other countries. Computer and statistical techniques are used to present the data from the first 72 Portland cement samples in graphical forms to better understand cement and cement testing. Data for each of 10 physical test properties and 11 chemical "compounds" of Portland cement are represented graphically through the use of box plots. For each property and compound, the box plots of data from multiple samples are plotted sequentially as distributed by CCRL and also sorted on median values. In several instances, box plots for one test property are ordered by the median values of another property to analyze possible relationships. Also, the characteristics of each of 72 cements are profiled (graphically) in relation to the population of results of other cements. These box plots and profiles provide insight for modeling cement performance which is the long-term goal of this study.